Johan jacob beegmann and gael emil huttkmeier



(No Model.)

J. J. BERGM'ANN 8v 0. E. HUTTEMEIER.

MACHINE FOR CHANGING SPEED.

Patented Apr. 11,1882.

WITNESSES .v r I .dttorneys N. PETERS PMn-Liihog'zphnr. Washmglon D C UNITED STATES PATENT ()EEICE. Y

JOHAN JACOB BERGMANN AND CARL EMIL HUTTEMEIER, OF COPENHAGEN,

' DENMARK.

MACHINE FOR CHANGING SPEED.

SPECIFICATION forming part of Letters Patent No. 256,273, dated April 11, 1882.

Application filed November 28, 1881. (No model.)

To all whom it may concern Be it known that we, JOHAN JACOB BERG- MANN and CARL EMIL HUTTEMEIER, citizens of the Kingdom of Denmark, residing at Gopenhageu, in the Kingdomof Denmark, have invented certain new and useful Improvements in Machines for Changing Speed; and we do hereby declare the following to be a full, clear, and exact description of the invention, such as :0 will enable others skilled in the art to'which it appertains to make and use the same, reference being had to the accompanying drawings,- which form a part of this specification, and in which' Figure l is a side elevation, and Fig. 2 is a front view.

Similar letters of reference indicate corresponding parts in both the figures.

Our invention has relation to machines or mechanical appliances for changing speed;

and it consists in the construction and combination of parts of a machine of that class which is specially adapted to change the speed ofsewing-machines and similarlightmachinery 2 without stopping either the motor or the machine operated by the motor.

In the accompanying drawings, the letter A represents the base or bed plate of the machine, which has two vertical posts or uprights,

B B, placed opposite to each other and slotted longitudinally, as shown in Fig. 2. 7

bis an axle, one of the journal-boxes, 0, of which is pivoted between studs d d in one of the slotted posts, while the other box, f, slides 3 5 in the slotted upright opposite, in which it may be adjusted by means of a rod or stem, m, having two stop-buttons, a and n The stem at may be pushed up or down to adjust the position of box f in its slotted post by means I 0 of a treadle at its lower end, or by a hand-lever, or by any other suitable means.

Upon the projecting end of axle b is affixed a pulley, a, to which a rotary motion is imparted (by means of an endless band) by the 4 5 power machine or motor. Upon the same axle,

between the standards B B, is at'fixed a coneshaped disk, Z, the sides of which, however, are not straight, but slightly curved, as shown in the drawings.

Above the axle bis another axle, g, journaled in two boxes, h and t, one of which, h, is movable around studs or trunnions d cl in the slotted standard B in like manner as box 0 in B, while the other, t', is movable up or down in the slotted standard B in like manner as f in B[ The two boxes i and c in standard B are connected by a spiral spring, 0.

Upon the outer end of the upper axle, g, is affixed a pulley, p, and upon thesame axle, between the standards, is secured a cone-shaped disk, It, constructed like the corresponding lower disk, I, with swelled orcurvilinear sides. An endless band or chain passes from the pulleyp to the sewing-machine or other mechanism which is run by the motor, and thespeed of which it is desired to make variable without changing the speed of the motor or powermachine.

From the foregoing, taken in connection with the drawings, it will be seen that by raising or lowering the movable journal-box f of axle b in its slotted post or standard B (by means of its stem m) the point of contact between the two disks l and may be changed or varied, contact being maintaiiied by means of the spiral spring 0, which connects the pivoted box 0 of axle b with the sliding boxi of axle g. It will also be seen that by changing in this'manner the point of contact between the two disks 1 and 7c the speed of one of them may be varied at will without affecting the speed of its mate. Thus while disk I, operated by the power-machine, rotates at an even velocity, it may be so adjusted as to rotate its mate 70 at the same velocity or at a greater or less velocity, according to whether the point of contact between the' two is near the apex or base of the upper disk or equidistant from both. latter case, of course, the two disks will rotate with the same speed. When box f is lowered till the stop-button it strikes the base-plateA the sliding box a of the upper axle will rest against a stop,,q, on standard B, and the two disks 7c and Zwill not touch each other. Hence the motion of the sewing-machine or other mechanism is stopped without stopping the motion of the power-machine.

It is obvious that the two axles b and 9 need In the not be horizontal, as in the drawings, but may be vertical, or occupy any other position without affecting the operation of the machine, the relative position of the parts being the same.

Having thus described our invention, we claim and desire to secure by Letters Patent of the United States 1. In a machine or apparatus for changing speed, the combination of two cone-shaped disks having swelled or curvilinear frustums, mounted upon axles provided respectively with one pivoted and one sliding box, substantially in the manner and for the purpose herein shown and set forth. Y

2. The machine or apparatus for changing speed herein shown and described, composed of the base A, having slotted standards B B, pivotedjournal-boxcsc h, slidingjournal-boxes f 1', rod m, having stop-buttonsn and a spring 0, and axles I) g, provided respectively with the cone disks Z k and pulleys a p, the whole constructed and combined to operate substantially as and for the purpose herein shown and specified.

In testimony whereof we have hereto affixed our signatures in presence of two witnesses.

JOHAN JAOOB BERGMANN. CARL EMIL HUTTEMEIER.

Witnesses:

R. F. BERGGREEN, H. P. RASMUSSEN. 

